OZG-5156 Code cleanup for review

* changed Unit Test to assertJ
* Moved config to Class

fim-adapter/src/main/java/de/ozgcloud/eingang/fim/FimService.java

@@ -88,7 +88,7 @@ public class FimService {
         return builder.build();
     }
 
-    protected FimScheme getSchemeForIdentifier(final String fimSchemaName) {
+     FimScheme getSchemeForIdentifier(final String fimSchemaName) {
         final FimSchemeIdentifier fimSchemeIdentifier = FimSchemeIdentifier.fromString(fimSchemaName);
         final FimScheme fimScheme = fimSchemeCatalogue.get(fimSchemeIdentifier);
         if (fimScheme == null) {

fim-adapter/src/test/java/de/ozgcloud/eingang/fim/FimServiceITCase.java

@@ -189,8 +189,4 @@ public class FimServiceITCase {
         final DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
         return builder.parse(new File(path));
     }
-
-    private Map<String, Object> map(final Object o) {
-        return (Map<String, Object>) o;
-    }
 }